Large language models

Vision Language Model Alignment in TRL ⚡️

How Amgen uses GPT-5

Learn how Amgen uses GPT-5.

GPT-5 System Card

This GPT-5 system card explains how a unified model routing system powers fast and smart responses using gpt-5-main, gpt-5-thinking, and lightweight versions like gpt-5-thinking-nano, optimized for different tasks and developer use.

How Cursor uses GPT-5

Learn how Cursor uses GPT-5.

From hard refusals to safe-completions: toward output-centric safety training

Discover how OpenAI's new safe-completions approach in GPT-5 improves both safety and helpfulness in AI responses—moving beyond hard refusals to nuanced, output-centric safety training for handling dual-use prompts.

Introducing GPT-5

We are introducing GPT‑5, our best AI system yet. GPT‑5 is a significant leap in intelligence over all our previous models, featuring state-of-the-art performance across coding, math, writing, health, visual perception, and more.

First look at GPT-5

See how a group of leading developers use GPT-5 for the first time.

GPT-5: Our best model for work

Watch a GPT-5 demo for work showing how the model can analyze feedback, create a product plan and prototype, and summarize next steps.

Delegate work to ChatGPT agent

Watch a ChatGPT agent demo showing how it can research, code, and take action online to complete a business plan in minutes.

Providing ChatGPT to the Entire U.S. Federal Workforce

Today, OpenAI for Government is announcing a new partnership with the U. S.

Welcome GPT OSS, the new open-source model family from OpenAI!

Estimating worst case frontier risks of open weight LLMs

In this paper, we study the worst-case frontier risks of releasing gpt-oss. We introduce malicious fine-tuning (MFT), where we attempt to elicit maximum capabilities by fine-tuning gpt-oss to be as capable as possible in two domains: biology and cybersecurity.

Introducing gpt-oss

We’re releasing gpt-oss-120b and gpt-oss-20b—two state-of-the-art open-weight language models that deliver strong real-world performance at low cost. Available under the flexible Apache 2.

gpt-oss-120b & gpt-oss-20b Model Card

We introduce gpt-oss-120b and gpt-oss-20b, two open-weight reasoning models available under the Apache 2. 0 license and our gpt-oss usage policy.

Measuring Open-Source Llama Nemotron Models on DeepResearch Bench

What we’re optimizing ChatGPT for

We build ChatGPT to help you thrive in all the ways you want. Learn how we're improving support for tough moments, have rolled out reminders to take breaks, and are working on better life advice, all guided by expert input.

📚 3LM: A Benchmark for Arabic LLMs in STEM and Code

Unlocking the potential of vision language models on satellite imagery through fine-tuning

Announcing Codestral 25.08 and the Complete Mistral Coding Stack for Enterprise

Introducing study mode in ChatGPT

Introducing study mode in ChatGPT, a new learning experience that helps you work through problems step by step, guiding students with questions, scaffolding, and feedback for deeper learning.